FK Series reels Offered in a full reel, the FK series of aluminium electrolytic capacitors from Panasonic are a miniaturised version of the FC series, featuring impedance values 40-60% less than the FC series. These electrolytic capacitors have a long life of up to 5000 hours and are AEC-Q200 qualified, making them suitable for automotive applications. Part numbers with an A* suffix are able to withstand high reflow temperatures for extended periods.